Creating VLAN on Cisco 3800 Series

[amirsd001]

Hello

I am new to networking. We have a Cisco 3800 series router with 64 ports. We have connected servers and PC's directly to the back of the router. Almost all of the ports are used with the exception of few. We would like to create a VLAN for the remaining few ports. I am able to telnet to the router or connect directly using hyper terminal.

I have been told that we cannot create VLAN's directly on the router. For that purpose we need to first get a switch and connect the switch to the router, then create VLAN’s using the switch. Can someone please provide some tips? Any suggestions would be nice…Thanks

[SANTHOSHKUMAR SARAVANAN]

Hi ,

 Below link should support your requirement 

http://www.cisco.com/c/en/us/support/docs/interfaces-modules/network-modules/82156-ether-switch-nm-config.html

create VLANs


Router1#vlan database
Router1(vlan)#vlan 10
VLAN 10 added:
    Name: VLAN0010
Router1(vlan)#vlan 51
VLAN 51 added:
    Name: VLAN0051
Router1(vlan)#vlan 50
VLAN 50 added:
    Name: VLAN0050
Router1(vlan)#vlan 100
VLAN 100 added:
    Name: VLAN0100
Router1(vlan)#vlan 200
VLAN 200 added:
    Name: VLAN0200
Router1(vlan)#exit
APPLY completed.
Exiting....
Router1#

Port for Server Configuration


Router1(config)#interface fastEthernet 1/2
Router1(config-if)#switchport mode access
Router1(config-if)#switchport access vlan 10
Router1(config-if)#spanning-tree portfast
Router1(config-if)#speed 100
Router1(config-if)#duplex full
Router1(config-if)#exit

HTH

Sandy

[amirsd001]

Thanks for the answer. Going forward when I issued the command #show vlan-switch. I saw VLAN 1 as default and active. I did not see any ports assigned to VLAN 1. I was expecting to see all the 64 ports (e.g fa0/1...etc) showing up on VLAN 1, but I do not see any ports listed.  Maybe no ports are defined in the VLAN 1? As before all the devices PC, servers, Printers..etc are directly connected to the back of this CISCO 3800 series router. They are able to communicate with each other. Also they are all on one subnet 10.16.3.x.

If I make a new VLAN e.g test VLAN and only assign two ports to this new VLAN. Do I have to assign a new static IP addresses to these new ports. Can they the new VLAN ports use the IP addresses from already defined subnet 10.16.3.X....Thanks

[SANTHOSHKUMAR SARAVANAN]

Hi ,

 Can i have your device config 

1) Show running-config

2) show vlan-switch

Do you want to create vlan or you want to assign ports from existing vlan . 

HTH

Sandy 

[amirsd001]

Appreciate you getting back. Here is the "show vlan-switch" output

----------------------->

#show vlan-switch
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active
1002 fddi-default                     active
1003 token-ring-default               active
1004 fddinet-default                  active
1005 trnet-default                    active
VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        1002   1003
1002 fddi  101002     1500  -      -      -        -    -        1      1003
1003 tr    101003     1500  1005   0      -        -    srb      1      1002
1004 fdnet 101004     1500  -      -      1        ibm  -        0      0
1005 trnet 101005     1500  -      -      1        ibm  -        0      0

---------------------->

As before I do not see any VLAN's set up. How come all the ports are not showing up on default VLAN 1. Maybe I can create a new VLAN and assign 2 or 3 ports to it. Please advise...Thanks

[SANTHOSHKUMAR SARAVANAN]

Hi ,

 Can i have show version & Show run of your router ??

HTH

Sandy